** Tags added: ubuntu-certified
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https://bugs.launchpad.net/bugs/1423631
Title:
tap interface drops many packets on highload systems
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This is fact, you can't get high PPS with tap interface because they run
in kernel space and it drive packets on kernel which isn't scalable.
Finally i have migrate all my compute nodes to SR-IOV and much happy
now.
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We are having same issue on CentOS7 and i have increase tx_queue upto
1 but i am still seeing TX drops on tap interface.
Question:
Can i increase tx_queue on interface with "ifconfig
txqueue 1" without rebooting machine?
OR
I have to do it at boot time?
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I also see this bu only on Windows guests.
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Title:
tap interface drops many packets on highload systems
To manage notifications about this bug
I also see this bu only on Windows guests.
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https://bugs.launchpad.net/bugs/1423631
Title:
tap interface drops many packets on highload systems
To manage notifications
I was able to resolve this with the below udev rule:
# cat /etc/udev/rules.d/60-tap.rules
KERNEL=="tap*", RUN+="/sbin/ip link set %k txqueuelen 1"
#
I used the below to reload udev
udevadm control --reload-rules
I then used the below to apply the rules to already created interfaces:
I was able to resolve this with the below udev rule:
# cat /etc/udev/rules.d/60-tap.rules
KERNEL=="tap*", RUN+="/sbin/ip link set %k txqueuelen 1"
#
I used the below to reload udev
udevadm control --reload-rules
I then used the below to apply the rules to already created interfaces:
I found the cause of the problem.
The tap interface of a instance has small tx length 500 packets. At a high
network load (15-25 Kpps) and high CPU load on a guest some times queue
overflows and the tap interface start drop network packages. I think that queue
overflow occurs in moments of
I found the cause of the problem.
The tap interface of a instance has small tx length 500 packets. At a high
network load (15-25 Kpps) and high CPU load on a guest some times queue
overflows and the tap interface start drop network packages. I think that queue
overflow occurs in moments of
Can you explain more about your setup?
Which version of openstack are you running?
How have you setup your instance?
Which operating system / kernel version are you running in your instance?
How are you generating outbound traffic from the instance?
Is the outbound traffic going through other
Can you explain more about your setup?
Which version of openstack are you running?
How have you setup your instance?
Which operating system / kernel version are you running in your instance?
How are you generating outbound traffic from the instance?
Is the outbound traffic going through other
** Description changed:
- I use qemu-kvm in openstak. On highload hypervisor tap interface of
net-highload gues drops many TX packages.
+ I use qemu-kvm in openstack. On highload hypervisor tap interface of
net-highload guest drops many TX packets.
Network options of qemu-system-x86_64 ...
** Description changed:
- I use qemu-kvm in openstak. On highload hypervisor tap interface of
net-highload gues drops many TX packages.
+ I use qemu-kvm in openstack. On highload hypervisor tap interface of
net-highload guest drops many TX packets.
Network options of qemu-system-x86_64 ...
** Changed in: linux (Ubuntu)
Status: Incomplete = New
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https://bugs.launchpad.net/bugs/1423631
Title:
tap interface drops many packets on highload systems
To manage
** Changed in: linux (Ubuntu)
Status: Incomplete = New
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https://bugs.launchpad.net/bugs/1423631
Title:
tap interface drops many packets on highload systems
To
Please update the bug with system information by doing
apport-collect 1423631
** Also affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Please update the bug with system information by doing
apport-collect 1423631
** Also affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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apport information
** Tags added: apport-collected trusty
** Description changed:
I use qemu-kvm in openstak. On highload hypervisor tap interface of
net-highload gues drops many TX packages.
Network options of qemu-system-x86_64 ... -netdev
tap,fd=30,id=hostnet0,vhost=on,vhostfd=31
apport information
** Tags added: apport-collected trusty
** Description changed:
I use qemu-kvm in openstak. On highload hypervisor tap interface of
net-highload gues drops many TX packages.
Network options of qemu-system-x86_64 ... -netdev
tap,fd=30,id=hostnet0,vhost=on,vhostfd=31
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